g: fix dcrypto key context initialization
g: fix dcrypto key context initialization

mempy should be using size of the object, not size of the pointer.

BRANCH=none
BUG=none
TEST=make buildall -j

Change-Id: I1ccb8ca4c313da8dad45b19375f390cfb346ac65
Signed-off-by: Vadim Bendebury <5515d6d2d0829cbe0dd0dcf2094aaded06d58514@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/431106
Reviewed-by: Marius Schilder <d423f2980be0298efdef7df239b147d21d472f26@chromium.org>
Reviewed-by: Nagendra Modadugu <5dc366ddbf8fb5981f46478e8436ef712a08b71b@google.com>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec